Slight pull under load

[itsslow06]

Soo I put new tires on my car, 275/40/18 sumititos or whatever they're called..... And when under a load doesn't have to be wot, it pulls left... Never done it before with the old tires (Goodyear eagle f1 gt, same size) .... Haven't changed any suspension within the past week... I had changed springs out for a few pulls on some slicks 2weekends ago, put the springs back how they were.... Tire pressures are the same, 30psi, I just don't know.... Hopefully someone can help...

Thanks
-kyle


Sent from the mustang!!

 

[skwerl]

It's either your alignment or a bad tire. Swap the front tires and see if it changes or pulls the opposite direction. If so then you have a tire warranty issue. If nothing changes then it's in your alignment.

 

[Weou09]

Check the bushings in the lower control arms. I had a similar issue and it was a torn bushing in the passenger side control arm. Normal driving was fine but getting on the interstate it would pull slightly.

 

[itsslow06]

Check the bushings in the lower control arms. I had a similar issue and it was a torn bushing in the passenger side control arm. Normal driving was fine but getting on the interstate it would pull slightly.

That's about what happens... I'll look into some poly bushings


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[shawnxrox]

Polybushings then get an alignment check

 

[Sky Render]

It's either your alignment or a bad tire. Swap the front tires and see if it changes or pulls the opposite direction. If so then you have a tire warranty issue. If nothing changes then it's in your alignment.

This. Defective tires can be conical instead of cylindrical, which would make it pull to one side.

Or, your new tires have a different tread design that simply causes your car to tramline more than it did before. FYI, my Nitto NT555s and suspension mods cause my car to tramline on almost all roads. And the 285 Goodyears I use for competition make it tramline even more.

 

[AbdullaGT500]

Check the LCA relocation brackets and make sure they're still tight.

 

[Shotokan1509]

Check the bushings in the lower control arms. I had a similar issue and it was a torn bushing in the passenger side control arm. Normal driving was fine but getting on the interstate it would pull slightly.

This was my issue years ago

 

[86GT351]

Soo I put new tires on my car, 275/40/18 sumititos or whatever they're called..... And when under a load doesn't have to be wot, it pulls left... Never done it before with the old tires (Goodyear eagle f1 gt, same size) .... Haven't changed any suspension within the past week... I had changed springs out for a few pulls on some slicks 2weekends ago, put the springs back how they were.... Tire pressures are the same, 30psi, I just don't know.... Hopefully someone can help...

Thanks
-kyle


Sent from the mustang!!

After you changed the springs back did you do another Alignment? By going to a new tire with full trad it is possible to amplify an existing issue. If the tires are NOT directional the easiest test would be to cross rotate the front tires. L-R and R-L. If the issue goes away then the Tire coming off the L/F and Going to the Right would most likely have a Radial Pull.

When you changed the springs did you do Front and Rear? I ask because when the Front Struts got reinstalled and you did not do an Alignment, if there is possibly Camber issue that you can't see by eye the car can push towards one side of the car. In this situation going Left the L/F Wheel would be slightly Positive (Tire Top leaning out) and the R/F would be slightly Negative (Tire top leaning in) This will surely lead your car to the Left.

 

[itsslow06]

I have checked the relo brackets and one was a bit loose but I tightened it... It cause the thrust angle to be off .5* fixed that it's back at 0... Readjusted the panhard bar, everything outback is tight.... I did not take the front springs off.... The front has some camber but not much.... I do need caster camber plates as the front has about 2.5* of camber on both sides... The toe is perfect up front also... I'm thinking tires....


Sent from the mustang!!

 

[86GT351]

I have checked the relo brackets and one was a bit loose but I tightened it... It cause the thrust angle to be off .5* fixed that it's back at 0... Readjusted the panhard bar, everything outback is tight.... I did not take the front springs off.... The front has some camber but not much.... I do need caster camber plates as the front has about 2.5* of camber on both sides... The toe is perfect up front also... I'm thinking tires....


Sent from the mustang!!

This is not even close to spec. If it is Positive on one side and negative on the other that can cause your issue.

Spec is -0.75 +/- 0.75.